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/* Construct a full filename from a directory and a relative filename.
Copyright (C) 2001-2004, 2006-2023 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <haible@clisp.cons.org>. */
#include <config.h>
/* Specification. */
#include "concat-filename.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "filename.h"
/* Concatenate a directory filename, a relative filename and an optional
suffix. The directory may end with the directory separator. The second
argument may not start with the directory separator (it is relative).
Return a freshly allocated filename. Return NULL and set errno
upon memory allocation failure. */
char *
concatenated_filename (const char *directory, const char *filename,
const char *suffix)
{
char *result;
char *p;
if (strcmp (directory, ".") == 0)
{
/* No need to prepend the directory. */
result = (char *) malloc (strlen (filename)
+ (suffix != NULL ? strlen (suffix) : 0)
+ 1);
if (result == NULL)
return NULL; /* errno is set here */
p = result;
}
else
{
size_t directory_len = strlen (directory);
int need_slash =
(directory_len > FILE_SYSTEM_PREFIX_LEN (directory)
&& !ISSLASH (directory[directory_len - 1]));
result = (char *) malloc (directory_len + need_slash
+ strlen (filename)
+ (suffix != NULL ? strlen (suffix) : 0)
+ 1);
if (result == NULL)
return NULL; /* errno is set here */
memcpy (result, directory, directory_len);
p = result + directory_len;
if (need_slash)
*p++ = '/';
}
p = stpcpy (p, filename);
if (suffix != NULL)
stpcpy (p, suffix);
return result;
}
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